What are those little green worms floating in the air?

Explaining Insects 🦋 on Instagram: "The inchworm is a small, green or brown caterpillar known for its unique way of moving — it appears to “measure” the ground as it goes. Instead of crawling smoothly like most caterpillars, the inchworm loops its body: it brings its back end forward to meet its front legs, forming an arch, then stretches out again. This gives it the nickname “measuring worm.” Inchworms are the larvae of geometer moths, and their looping motion inspired the Greek name geometra,